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Unique field does not work if used with Automatic Entity Label.
I am guessing it is because the title is not created until after the node is saved.
I understand that technically we should be able to just validate the specific fields that make up the title, but that does not always work.
Other related issues:
https://www.drupal.org/node/1075036
https://www.drupal.org/node/1546744
Comments
Comment #2
P2790 CreditAttribution: P2790 commentedComment #3
P2790 CreditAttribution: P2790 commentedStrongly recommend using below module if you are are having this issue:
https://www.drupal.org/project/entity_unique